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12d+6=18+-48+9d
We move all terms to the left:
12d+6-(18+-48+9d)=0
We add all the numbers together, and all the variables
12d-(9d-30)+6=0
We get rid of parentheses
12d-9d+30+6=0
We add all the numbers together, and all the variables
3d+36=0
We move all terms containing d to the left, all other terms to the right
3d=-36
d=-36/3
d=-12
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